ref: f7b7a351084295118143a25000512280b1c9e45b
dir: /src/aubio.h/
/* Copyright (C) 2003-2015 Paul Brossier <piem@aubio.org> This file is part of aubio. aubio is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. aubio is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with aubio. If not, see <http://www.gnu.org/licenses/>. */ /** \mainpage \section introduction Introduction aubio is a library to extract annotations from audio signals: it provides a set of functions that take an input audio signal, and output pitch estimates, attack times (onset), beat location estimates, and other annotation tasks. \section basics Basics All object structures in aubio share the same function prefixes and suffixes: - \p new_aubio_foo creates the object \p foo - \p aubio_foo_do executes the object \p foo - \p del_aubio_foo destroys the object \p foo All memory allocation and deallocation take place in the \p new_ and \p del_ functions. Optionally, more than one \p _do methods are available. Additional parameters can be adjusted and observed using: - \p aubio_foo_get_param, getter function, gets the value of a parameter - \p aubio_foo_set_param, setter function, changes the value of a parameter Unless specified in its documentation, no memory operations take place in the getter functions. However, memory resizing can take place in setter functions. \subsection vectors Vectors Two basic structures are being used in aubio: ::fvec_t and ::cvec_t. The ::fvec_t structures are used to store vectors of floating pointer number. ::cvec_t are used to store complex number, as two vectors of norm and phase elements. Additionally, the ::lvec_t structure can be used to store floating point numbers in double precision. They are mostly used to store filter coefficients, to avoid instability. \subsection objects Available objects Here is a list of some of the most common objects for aubio: \code // fast Fourier transform (FFT) aubio_fft_t *fft = new_aubio_fft (winsize); // phase vocoder aubio_pvoc_t *pv = new_aubio_pvoc (winsize, stepsize); // onset detection aubio_onset_t *onset = new_aubio_onset (method, winsize, stepsize, samplerate); // pitch detection aubio_pitch_t *pitch = new_aubio_pitch (method, winsize, stepsize, samplerate); // beat tracking aubio_tempo_t *tempo = new_aubio_tempo (method, winsize, stepsize, samplerate); \endcode See the <a href="globals_type.html">list of typedefs</a> for a complete list. \subsection example Example Here is a simple example that creates an A-Weighting filter and applies it to a vector. \code // set window size, and sampling rate uint_t winsize = 1024, sr = 44100; // create a vector fvec_t *this_buffer = new_fvec (winsize); // create the a-weighting filter aubio_filter_t *this_filter = new_aubio_filter_a_weighting (sr); while (running) { // here some code to put some data in this_buffer // ... // apply the filter, in place aubio_filter_do (this_filter, this_buffer); // here some code to get some data from this_buffer // ... } // and free the structures del_aubio_filter (this_filter); del_fvec (this_buffer); \endcode Several examples of C programs are available in the \p examples/ and \p tests/src directories of the source tree. Some examples: - @ref spectral/test-fft.c - @ref spectral/test-phasevoc.c - @ref onset/test-onset.c - @ref pitch/test-pitch.c - @ref tempo/test-tempo.c - @ref test-fvec.c - @ref test-cvec.c \subsection unstable_api Unstable API Several more functions are available and used within aubio, but not documented here, either because they are not considered useful to the user, or because they may need to be changed in the future. However, they can still be used by defining AUBIO_UNSTABLE to 1 before including the aubio header: \code #define AUBIO_UNSTABLE 1 #include <aubio/aubio.h> \endcode Future versions of aubio could break API compatibility with these functions without warning. If you choose to use functions in AUBIO_UNSTABLE, you are on your own. \section download Download Latest versions, further documentation, examples, wiki, and mailing lists can be found at https://aubio.org . */ #ifndef AUBIO_H #define AUBIO_H /** @file aubio.h Global aubio include file. You will want to include this file as: @code #include <aubio/aubio.h> @endcode To access headers with unstable prototypes, use: @code #define AUBIO_UNSTABLE 1 #include <aubio/aubio.h> @endcode */ #ifdef __cplusplus extern "C" { #endif /* in this order */ #include "types.h" #include "fvec.h" #include "cvec.h" #include "lvec.h" #include "fmat.h" #include "musicutils.h" #include "vecutils.h" #include "temporal/resampler.h" #include "temporal/filter.h" #include "temporal/biquad.h" #include "temporal/a_weighting.h" #include "temporal/c_weighting.h" #include "spectral/fft.h" #include "spectral/phasevoc.h" #include "spectral/filterbank.h" #include "spectral/filterbank_mel.h" #include "spectral/mfcc.h" #include "spectral/specdesc.h" #include "spectral/tss.h" #include "pitch/pitch.h" #include "onset/onset.h" #include "tempo/tempo.h" #include "notes/notes.h" #include "io/source.h" #include "io/sink.h" #include "synth/sampler.h" #include "synth/wavetable.h" #include "utils/parameter.h" #include "utils/log.h" #if AUBIO_UNSTABLE #include "mathutils.h" #include "io/source_sndfile.h" #include "io/source_apple_audio.h" #include "io/source_avcodec.h" #include "io/source_wavread.h" #include "io/sink_sndfile.h" #include "io/sink_apple_audio.h" #include "io/sink_wavwrite.h" #include "io/audio_unit.h" #include "onset/peakpicker.h" #include "pitch/pitchmcomb.h" #include "pitch/pitchyin.h" #include "pitch/pitchyinfft.h" #include "pitch/pitchschmitt.h" #include "pitch/pitchfcomb.h" #include "pitch/pitchspecacf.h" #include "tempo/beattracking.h" #include "utils/scale.h" #include "utils/hist.h" #endif #ifdef __cplusplus } /* extern "C" */ #endif #endif